Practice free Biomolecules (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Lactose is composed of
(c) Lactose (C12H22O11) is a disaccharide found in mammalian milk. It comprises galactose and glucose units which are linked together by b, 1-4 glycosidic bonds. It is a reducing sugar.
Which one of the following amino acids is an essential part of human diet ?
(b) For human beings, eight amino acids are essential. these are leucine, isoleucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine.
The haemorrhagic disease of new born is caused due to the deficiency of
(d) The haemorrhagic disease of new born is caused due to the deficiency of vitamin-K, characterised by delayed blood clotting and haemorrhage (blood loss).
Calcium deficiency occurs in the absence of vitamin
(a) Vitamin-D (calciferol/antirachitic factor) mainly helps in Ca/P balance in the body fluids. It increases absorption of calcium from intestine so, it is necessary for formation of healthy bones and teeth Deficiency of vitamin-D causes increased loss of Ca+ in urine, so, no Ca- gets deposited in the bones. This cause rickets in children and in pregnant woman it causes osteomalacia.
The vitamin-C or ascorbic acid prevents
(c) Vitamin-C or ascorbic acid prevents scurvy (failure to form connective tissue). Characterised by bleeding gums, anaemia, loose teeth, painful and swollen joints, delayed healing of wounds and emaciation.
Which group of three of the following five statements (A-E) contains all three correct statements regarding beri-beri ?
A-A crippling disease prevalent among the native population of sub-Sahara Africa
B- .A deficiency disease caused by lack of thiamine (vitamin-B,)
C .A nutritional disorder in infants and young children when the diet is persistently deficient in essential protein
D.Occurs in those countries where the staple diet is polished rice
E. The symptoms are pain from neuritis, paralysis, muscle wasting, progressive oedema, mental deterioration and finally heart failure
(d) The deficiency of vitamin-B, or thiamine is the disease beri-beri. This disease occurs in those
countries where the staple diet is polished rice. The symptoms of this disease are pain from neuritis,
paralysis, muscle wasting, progressive oedema, mental deterioration and finally heart failure.
Which of the following is required in small quantities?
NCERT page number 257.
Which of the following hormones is NOT an amino-acid derivative?
According to the NCERT text, amino-acid derivatives include epinephrine. Norepinephrine is also an amino acid derivative. Thyroxine (iodothyronine) is derived from tyrosine, an amino acid. Cortisol, on the other hand, is a steroid hormone. Therefore, Cortisol is not an amino-acid derivative.
Hormones that interact with membrane-bound receptors primarily achieve their cellular effects by:
The NCERT text states: 'Hormones which interact with membrane-bound receptors normally do not enter the target cell, but generate second messengers (e.g., cyclic AMP, IP3, Ca++ etc) which in turn regulate cellular metabolism'.
Which of the following is true regarding peptide, polypeptide, and protein hormones?
Peptide, polypeptide, and protein hormones (e.g., insulin, glucagon) are listed as a group. The text also mentions that 'Hormones which interact with membrane-bound receptors normally do not enter the target cell, but generate second messengers'. Since peptide/protein hormones are water-soluble and generally do not cross the cell membrane, they interact with membrane-bound receptors and utilize second messengers.
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